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- Root cause: header-based class indexing (HEADER_CLASSIDX=1) wrote a 1-byte header during allocation, but linear carve/refill and initial slab capacity still used bare class block sizes. This mismatch could overrun slab usable space and corrupt freelists, causing reproducible SEGV at ~100k iters. Changes - Superslab: compute capacity with effective stride (block_size + header for classes 0..6; class7 remains headerless) in superslab_init_slab(). Add a debug-only bound check in superslab_alloc_from_slab() to fail fast if carve would exceed usable bytes. - Refill (non-P0 and P0): use header-aware stride for all linear carving and TLS window bump operations. Ensure alignment/validation in tiny_refill_opt.h also uses stride, not raw class size. - Drain: keep existing defense-in-depth for remote sentinel and sanitize nodes before splicing into freelist (already present). Notes - This unifies the memory layout across alloc/linear-carve/refill with a single stride definition and keeps class7 (1024B) headerless as designed. - Debug builds add fail-fast checks; release builds remain lean. Next - Re-run Tiny benches (256/1024B) in debug to confirm stability, then in release. If any remaining crash persists, bisect with HAKMEM_TINY_P0_BATCH_REFILL=0 to isolate P0 batch carve, and continue reducing branch-miss as planned.
142 lines
3.5 KiB
Markdown
142 lines
3.5 KiB
Markdown
# Pool TLS Phase 1.5a - Quick Start Guide
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Pool TLS Phase 1.5a は 8KB-52KB のメモリ割り当てを高速化する TLS Arena 実装です。
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## 🚀 クイックスタート
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### 1. 開発サイクル（最も簡単！）
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```bash
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# Build + Verify + Smoke Test を一発で実行
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./dev_pool_tls.sh test
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# 結果:
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# ✅ All checks passed!
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```
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### 2. ベンチマーク実行
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```bash
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# Pool TLS vs System malloc の性能比較
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./run_pool_bench.sh
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# 結果例:
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# HAKMEM (Pool TLS): 1790000 ops/s
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# System malloc: 189000 ops/s
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# Performance ratio: 947% (9.47x)
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# 🏆 HAKMEM WINS!
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```
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### 3. 個別ビルド
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```bash
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# Pool TLS Phase 1.5a を有効にしてビルド
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./build_pool_tls.sh bench_mid_large_mt_hakmem
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./build_pool_tls.sh larson_hakmem
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./build_pool_tls.sh bench_random_mixed_hakmem
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```
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## 📋 スクリプト一覧
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| スクリプト | 用途 | 使い方 |
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|-----------|------|--------|
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| `dev_pool_tls.sh` | 開発サイクル統合 | `./dev_pool_tls.sh test` |
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| `build_pool_tls.sh` | Pool TLS ビルド | `./build_pool_tls.sh <target>` |
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| `run_pool_bench.sh` | 性能ベンチマーク | `./run_pool_bench.sh` |
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| `build.sh` | 汎用ビルド（ChatGPT製） | `./build.sh <target>` |
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| `verify_build.sh` | ビルド検証（ChatGPT製） | `./verify_build.sh <binary>` |
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## 🎯 推奨ワークフロー
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### コード変更時
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```bash
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# 1. コード編集
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vim core/pool_tls_arena.c
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# 2. クイックテスト（5-10秒）
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./dev_pool_tls.sh test
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# 3. OK なら詳細ベンチマーク
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./run_pool_bench.sh
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```
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### デバッグ時
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```bash
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# 1. デバッグビルド
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./build_debug.sh bench_mid_large_mt_hakmem gdb
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# 2. GDB で実行
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gdb ./bench_mid_large_mt_hakmem
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(gdb) run 1 100 256 42
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```
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### クリーンビルド
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```bash
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# 全削除してリビルド
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./dev_pool_tls.sh clean
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./dev_pool_tls.sh build
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```
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## 🔧 有効化されている機能
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Pool TLS ビルドでは以下が自動的に有効化されます：
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- ✅ `POOL_TLS_PHASE1=1` - Pool TLS Phase 1.5a（8-52KB）
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- ✅ `HEADER_CLASSIDX=1` - Phase 7 header-based free
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- ✅ `AGGRESSIVE_INLINE=1` - Phase 7 aggressive inlining
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- ✅ `PREWARM_TLS=1` - Phase 7 TLS cache pre-warming
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**フラグを忘れる心配なし！** スクリプトが全て設定します。
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## 📊 性能目標
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| Phase | 目標性能 | 現状 |
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|-------|----------|------|
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| Phase 1.5a (baseline) | 1-2M ops/s | ✅ 1.79M ops/s |
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| Phase 1.5b (optimized) | 5-15M ops/s | 🚧 開発中 |
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| Phase 2 (learning) | 15-30M ops/s | 📅 予定 |
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## ❓ トラブルシューティング
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### ビルドエラー
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```bash
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# フラグ確認
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make print-flags
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# クリーンビルド
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./dev_pool_tls.sh clean
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./dev_pool_tls.sh build
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```
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### 性能が出ない
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```bash
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# ビルド検証（古いバイナリでないか確認）
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./verify_build.sh bench_mid_large_mt_hakmem
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# リビルド
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./build_pool_tls.sh bench_mid_large_mt_hakmem
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```
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### SEGV クラッシュ
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```bash
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# デバッグビルド
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./build_debug.sh bench_mid_large_mt_hakmem gdb
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# gdb で実行
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gdb ./bench_mid_large_mt_hakmem
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(gdb) run 1 100 256 42
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(gdb) bt
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```
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## 📝 開発メモ
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- **依存関係追跡**: `-MMD -MP` で自動検出（ChatGPT 実装）
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- **フラグ不整合チェック**: Makefile が自動検証（ChatGPT 実装）
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- **ビルド検証**: `verify_build.sh` でタイムスタンプ確認（ChatGPT 実装）
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## 🎓 詳細ドキュメント
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- `CLAUDE.md` - 開発履歴
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- `POOL_TLS_INVESTIGATION_FINAL.md` - Phase 1.5a 調査報告
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- `Makefile` - ビルドシステム詳細
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